1 Answer
1

GPS need a RS232 port and most of the PC's/Notebook come with only one.

Assuming you are using bluetooth GPS to transmit your GPS to PC, then you need to configure multiple virtual ports to handle this. So, you have many GPS receivers ready for handshake.

QGIS at the moment can handshake with one GPS port only. So, you need to modify QGIS to handshake muntiple GPS ports (com1,com2, com3,...).

For those who have one GPS but want to use many applications, like QGIS, Global Mapper etc at the same time with the same GPS, you need to get a serial port splitter and you can find many others by google search.